PostGIS  2.1.10dev-r@@SVN_REVISION@@
PG_FUNCTION_INFO_V1 ( RASTER_getPixelValue  )

Return value of a single pixel.

Pixel location is specified by 1-based index of Nth band of raster and X,Y coordinates (X <= RT_Width(raster) and Y <= RT_Height(raster)).

TODO: Should we return NUMERIC instead of FLOAT8 ?